Class: Scissor::VideoChunk

Inherits:
Chunk
  • Object
show all
Defined in:
lib/scissor-video/chunk.rb

Instance Method Summary collapse

Methods inherited from Chunk

#+

Constructor Details

#initialize(filename = nil) ⇒ VideoChunk

Returns a new instance of VideoChunk.



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# File 'lib/scissor-video/chunk.rb', line 15

def initialize(filename = nil)
  @fragments = []

  if filename
    @fragments << Fragment.new(
      filename,
      0,
      VideoFile.new(filename).length)
  end
end

Instance Method Details

#to_file(filename, options = {}) ⇒ Object 



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# File 'lib/scissor-video/chunk.rb', line 26

def to_file(filename, options = {})
  filename = Pathname.new(filename)

  if @fragments.empty?
    raise EmptyFragment
  end

  options = {
    :overwrite => false,
    :save_workfiles => false
  }.merge(options)

  filename = Pathname.new(filename)

  if filename.exist?
    if options[:overwrite]
      filename.unlink
    else
      raise FileExists
    end
  end

  concat_files = []
  ffmpeg = Scissor.ffmpeg

  position = 0.0
  tmpdir = ffmpeg.work_dir
  tmpfile = tmpdir + 'tmp.avi'

  begin
    @fragments.each_with_index do |fragment, index|
      fragment_filename = fragment.filename
      fragment_duration = fragment.duration

      fragment_tmpfile = tmpdir + (Digest::MD5.hexdigest(fragment_filename) + "_#{index}.avi")

      unless fragment_tmpfile.exist?
        ffmpeg.cut({
                     :input_video => fragment_filename,
                     :output_video => fragment_tmpfile,
                     :start => fragment.start,
                     :duration => fragment_duration
        })
        concat_files.push fragment_tmpfile
      end

      position += fragment_duration
    end

    Scissor.mencoder.concat({
                              :input_videos => concat_files,
                              :output_video => tmpfile
    })

    ffmpeg.encode({
                    :input_video => tmpfile,
                    :output_video => filename
    })
  ensure
    ffmpeg.cleanup unless options[:save_workfiles]
  end

  self.class.new(filename)
end